Charles e



(No Model.)

0. R. UHLMANN.

LOCK.

Patented Mar. 29, 1887.

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5o edge of the block, and this lip is grooved to 1 through the door, the lock is secure against 100 CHARLES R. UHLMANN, OF PEORIA, ILLINOIS.

LOCK.

SPECIFICATION forming part of Letters Patent No. 360,066, dated March 29, 1887.

(N model.)

To all whom it may concern.-

Beitknown that I, CHARLES R. UHLMANN, aresident of Peoria, in the county of Peoria and State ofIllinois, have invented certain new and useful Improvements in Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in means for rendering ordinary latches and locks secure against unlocking, and is fully described and explained in this specification and illustrated in the accompanying drawings, referred to herein by the numerals, in which-.-

Figure 1 is aside view of a mortise-lock provided with my devices, the side plate of the lock being removed to expose the interior. Fig. 2 is a similar view ofa portion of the lock, both thelooking-boltand the slidebeingthrown into position for securing the door to which the lock may be applied. Fig. 3 is a section on the line a: 1 Fig. 2, looking in the direction of the arrow. Fig. 4 is a section on the line 00' looking in the same direction. Fig. 5 is a View, partly in section, partly in elevation, of the slide-actuating mechanism. Fig.6 shows a modified form of the slide-actuating devices.

In all the drawings, 1 is the lock-case, containing without change an ordinary knob-catch and locking-bolt, the former actuated by the knob-spindle inserted in the aperture 5, the latter by a key inserted at 13. Except that a short post, 14, is rigidly fastened to the locking-bolt 11, these parts have no novelty in form. The spring-actuated tumbler is also common.

Below the bolt 3 11 is a block or slide, 22 15, which, when in the position shown in Fig. 1, permits the locking-bolt to act in the usual manner, but which in the position shown in Fig. 2 (occupied only when the lock-bolt is thrown forward) covers or obstructs the keyhole, and also prevents the rotation of the key to withdraw the bolt.

The block is of such thickness that it fills the space between the plate 24, Figs. 3 and 4, and the opposite side, 1, of the lock-case. A lip, 23, projects over the bolt 11 from the upper I permit it to pass over the post ll upon the lock-bolt. The body of the block is slotted, to permit it to slide upon a hub, 17, passing perpendicularly through it and revolubly supported by the lock-case side walls. A square axial opening, 18, in the hub allows the insertion of an actuating bar or key, 25, Fig. 5. The bar may be held in place by a collar secured to the face of the door, as indicated in dotted lines.

Near one end of the hub is a proj eeting arm, 16, by which the block is operated when the hub is rotated. The face of the block is cut away, forming a recess equal in depth to the thickness of the arm 16 and in width to the distance from the end of that arm to the opposite side of the hub 17. The thickness of the arm 16 is such that it cannotpass over the post 14 upon the bolt 11, and as when the bolt 11 is retracted, Fig. 1, this post comes within the space swept by the arm in its rotation, the device cannot be operated when the door is unlocked, but may act freely when the advance of the bolt 11, as in looking, has carried the post beyond the path of the arm 16.

Now, if with the several parts in the relation shown in Fig. 1 a suitable key be inserted at 13 and rotated, the bolt 11 may be thrown forward without moving the block 22 15, since the post 14 passes unobstructed through the groove in the lip 23. The key may now be withdrawn or not, and the block 22 15 be carried from its position in Fig. 1 to its position in Fig. 2 by rotating the bar 25, for its rota tion forces the end of the arm 16 against the wall of the depression in the block, gradually advancing it, just as the bit of the key advances the lock-bolt. The rotation should be continued until the arm 16 is parallel to the lower edge of the lock at least, for pressure upon the end of the block or slide, exerted by the key or otherwise, cannot then cause a reverse rotation of the arm 16. If the key has been withdrawn it cannot now be introduced into the look; if it has been left in the lock it cannot now be removed; and in either case the displacement of the slide by means other than the rotation of the bar is impossible. It follows that, since the bar 25 does not extend unlocking by any one upon the side opposite to the block-actuating, mechanism whenever the key has been left in the lock, as no opening through the door exists. If the key be not in the door, the opening into the lock and through the door is only the space that would be filled by the key-stem.

From what precedes, it is plain that the blockactuating mechanism is inoperative when the door is unlocked, for the post 14 prevents the rotation of the arm 16.

I do not wish to limit myself to the exact forms shown, since myinvention fairly covers some obvious changes, or such as become obvious when the ends to be accomplished are suggested to themind ofa mechanic. For eX- ample, the bar 25, hub 17, and arm 16 may be 7 united in the form of an ordinary key, as shown in Fig. 6, when, if the door and lock-case be properly constructed, the key may be removed at will. It is also plain that more complicated lock mechanisms may be employed in place of the simple depression, without'wards, in the slide, and that if the hub and arm be retained as a separate element the bar may be replacedbyless simple forms, Withoutinvention, corresponding changes being'made in thehub.

What I claim is 1. In a door-lock, the combination, with a reciprocating block adapted when in one position to cover the key-hole of the lock, of a bar having an arm engaging the block and adapted to move the same when the bar is rotated, and a lock-bolt provided with a lug which, when the bolt is retracted, acts as a stop for said arm and prevents the rotationof said bar.

2. The combination, with the hub 17, having the arm 16, of the lock-bolt 11, having the lug 14, and the block 15, slotted to permit its motion with reference to the hub, and grooved to permit motion with reference tothelug 14, said lug being adapted, when the bolt is retracted, to prevent rotation of the hub 17 and arm 16,

substantially as and for the purpose set forth.

In testimony whereofI have signed this specification in the presence of two subscribing Witnesses.

CHARLES R, UHLMANN.

\Vitnesses:

\VALLACE GREENE, GEORGE S. FEY. 

